Charmed Baryon Weak Decays with Vector Mesons

Abstract

We give a systematic study of ${\mathbf{B}}_c\to {\mathbf{B}}_{n}V$ decays, where ${\mathbf{B}}_c$ and ${\mathbf{B}}_n$ correspond to the anti-triplet charmed and octet baryons, respectively, while $V$ stand for the vector mesons. We calculate the color-symmetric contributions to the decays from the effective Hamiltonian with the factorization approach and extract the anti-symmetric ones based on the experimental measurements and $SU(3{)}_F$ flavor symmetry. We find that most of the existing experimental data for ${\mathbf{B}}_c\to {\mathbf{B}}_{n}V$ are consistent with our fitting results. We present all the branching ratios of the Cabbibo allowed, singly Cabbibo suppressed and doubly Cabbibo suppressed decays of ${\mathbf{B}}_c\to {\mathbf{B}}_{n}V$. The decay parameters for the daughter baryons and mesons in ${\mathbf{B}}_c\to {\mathbf{B}}_{n}V$ are also evaluated. In particular, we point out that the Cabbibo allowed decays of ${\Lambda }_c^{+}\to {\Lambda }^0{\rho }^{+}$ and ${\Xi }_c^0\to {\Xi }^{-}{\rho }^{+}$ as well as the singly Cabbibo suppressed ones of ${\Lambda }_c^{+}\to {\Lambda }^0{K}^{\ast +}$, ${\Xi }_c^{+}\to {\Sigma }^{+}\varphi$ and ${\Xi }_c^0\to {\Xi }^{-}{K}^{\ast +}$ have large branching ratios and decay parameters with small uncertainties, which can be tested by the experimental searches at the charm facilities.

23 pages, no figure

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